Automatic photo printing-machine.



G. M. DYE.

AUTOMATIC PHOTO PRINTING MACHINE.

APPLIGATION FILED AUG.7, 1911.

Patented Oct. 28, 1913.

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AUTOMATIC PHOTO PRINTING MACHINE.

APPLICATION 111,151) AUG.7, 1911.

1,076,876, Paented 001.2%,1913.

Z 7 SHEETSSHEET 2.

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G. M. DYE.

AUTOMATIC PHOTO PRINTING MACHINE.

APPLICATION FILED 11110.7, 1911.

1,076,876, Patented Oct. 28, 1913.

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AUTOMATIC PHOTO PRINTING MACHINE.

APPLICATION FILED AUG.7, 1911.

1,076,876, Patentd Oct. 28, 1913.

7 SHEETS-SHEET 4.

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MM WW4 I COLUMBIA PLANOGIAPH (10., WASHINGTON. I). c.

G. M. DYE.

AUTOMATIC PHOTO PRINTING MACHINE.

APPLICATION 111.211.1 .113. 7, 1911.

1,076,876. Patented Oct. 28, 1913.

1 SHEETS-SHEET 5.

APPLICATION FILED AUG. 7, 1911.

Patented Oct. 28, 1913.

7 SHEETS-SHEET 6.

COLUMBIA PLANOGRAyM C0-. WASHINGTON. u. c.

G. M. DYE.

AUTOMATIC PHOTO PRINTING MACHINE.

APPLICATION FILED AUG. 7, 1911.

1,076,876. Patented Oct. 28, 1913.

I SHEETSSHEET 7.

lllhi COLUMBIA PLANOGRAPH 20., WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

GLEN M. DYE, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CHARLES E. VAN DUZEE, 0F MINNEAPOLIS, MINNESOTA.

AUTOMATIC PHOTO PRINTING-MACHINE.

Application filed August 7, 1911.

To all whom it may concern Be it known that I, GLEN M. DYE, a citizen of the United States, residing at, Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Automatic Photo Printing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its object to provide an improved photographic printing machine, and relates particularly to that type of photographic printing machines disclosed and claimed broadly in my U. S. Patent No. 1,001,373 issued of date August 22d, 1911, and entitled Automatic printing machine.

To the above ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the machine of my said prior application, the light for printing purposes is supplied by one or more electric lamps, and the energy for drivingthe machine-is supplied by an electric motor, and the said motor and lamp are so electrically connected that the intensity of the light will vary with the speed of the motor, when there are fluctuations and variations in the current. This feature is preferably employed in the present machine but is not per se, a partof the present invention.

The lamps are inclosed in a light box having a light passage in or at which the negative is exposed. The sensitive paper on which the print is to be made is pressed against the negative by a two-part progressively movable presser board, between which and the negative, the sensitive paper is delivered by an intermittently operative socalled paper carrier. The presser board is actuated from the motor with a timed action, which timed action is made variable by an adjustable timing device.

One feature of the present invention is directed to the improvement of this socalled timing device which, in a more elementary but operative form, is disclosed and claimed in my said earlier application.

Another feature of the present invention is directed to the improvement of the mecha- Specification of Letters Patent.

Patented Oct. 28, 1913.

Serial No. 642,693.

nism for operating the segmental presser board.

Another feature of the present invention is directed to the improvement of the socalled paper carrier.

Still another feature of the invention is directed to a novel cooperative relation of a pivotally mounted light box and work table.

The same invention also includes other minor novel features hereinafter described and particularly pointed out in the claims.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view in side elevation showing the complete machine with the parts in what may be treated as normal positions; Fig. 2 is a front elevation of the machine with some parts broken away; Figs. 3 and 4 are vertical sections taken from front to rear of the machine approximately on the line ac -m of Fig. 2, but illustrating different positions of the parts; Fig. 5 is a vertical section taken through the light box, presser board and cooperating parts approximately on the line w -m of Fig. 2, but showing a position of the presser board not shown in any other of the views, with some parts being broken away; Fig. 6 is a plan view of the light box showing the same turnedintoa position in which the negative carried thereby is turned into a horizontal position; Fig. 7 is a segmental view with parts broken away and some parts removed, the section thereof being taken approximately on the same line as Fig. 4, but showing the light box turned into the position indicated in Fig. 6; Fig. 8 is a section taken approximately on the line cn m of Fig. 2 and showing the preferred construction of the improved timing device with some parts being broken away; Fig. 9 is a detail view chiefly in elevation but partly in section, looking at the parts shown in Fig. 8 from the left toward the right; Fig. 10 is a fragmentary detail in section on the line xac of Fig. 9; Fig. 11 is a section taken on the line xm of Fig. 10, and showing parts illustrated in Fig. 10, some parts being broken away; and Fig. 12 is a detail in section on the line 00 -40 of Fig. 2.

The framework 1 of the machine, as shown, is a rectangular skeleton structure made of wood, but it may take any suitable form and may be made of any suitable material. The so-called light box 2 is a rectangular structure connected by hinges 3 to one of the cross bars of the frame 1, so that it may be turned from an operative position shown in Figs. 1 to 5 inclusive, into an inoperative position shown in Figs. 6 and 7, and vice versa. One face or side of this light box 2 is provided with a light passage 4 in which a glass plate 5 is secured. The negative 6 is adapted to be secured in the proper position on the glass plate 5 by a negative holder of any suitable construction, but which, as shown, is made up of a thin transverse metal strip 8, pivoted arms 9 and a spring-pressed clamping head 10. The strip 8 is shown as secured to the working face or side of the box 2, while. the arm 9 and clamping head 10 are pivoted thereto. These elements 8, 9 and 10 afi ord a negative holder. w H

The numeral 11 indicates legs pivoted at their upper ends to the ends of the light box 2, with their intermediate portions connected to the rear legs ofthe framework 1, by pivoted links 12. These legs 11 serve to support the light box in its inoperative position shown in Figs. 6 and 7, in which position, the negative 6 and the negative supporting platev 5 are turned into a horizontal position which adapts the negative to be easily removed or applied and properly adjusted.

The small work table 12 is connected to the upper side bars of the frame 1 by parallel links 13- which are so, arranged that when the light brox is turned into its'opera-.

tive position,,said table; will reston theupwardly. projecting front plate thereof, as best shown in Figs. 1 and 3, and when the said light box is turned over or into its in-- operative position,- the said work table will be dropped into a lowered position on a level with the then upturned front plate of the box and with the uppersurface of the negative supporting plate 5. That side or plate of the light box which is provided with the light passage t and with the negative supporting plate 5, is herein designated as the front plate of the light box. In the position of the parts shown in Fig. 7, the working table 12 acts as a sort of a lock to preventthe light box from being turned into an operative position until after the said working table has first been raised. Secured to the framework 1 just below the light box is a print receptacle or receiving hopper 14.

The numerals 15 and 16 indicate what may, for convenience, be-designated as the main and supplemental sections of the divided presser plate or board which serves to press the sheets of sensitive printing paper against the negative. The said plate sections 15 and 16 are secured, respectively, to the upper ends of long light metal arms 17 and 18, the lower ends of which are shown as pivoted on a transverse rod 19, secured to the lower side bars of the frame 1. The arms 17 and 18 are preferably made flexible, so that they will not interfere with proper seating of the presser plate sections against the negative. The said presser plate sections 15 and 10 are connected, respectively, by toggles 20 and 21, to a thrust bracket 22, secured on the upper front bar of the frame 1. The front members of the toggles 20 and 21 are pivotaliy connected, respectively, at the upper ends to crank or thrust rods 23 and 24, the lower ends of which are bifurcated and straddle a shaft 25, journaled in suitable bearing brackets 26 and 27, secured on the frame 1 (sec particularly Figs. 2, 3, 4 and 8).

One of the sensitized sheets of printing paper upon which a picture is to be printed from the negative 6, is indicated by the character y in Figs. 1, 3, 4 and 5. The sensitized paper y, which may be briefly designated as the paper is adapted to be automatically positioned between the negative and the presser plate, by a so-called paper carrier of novel construction, and

which, as shown, comprises a pair of laterally paced arms 28, the free ends of which are connected to a transverse clamping bar 29, and the lower ends of which are secured to transverse rock bar 30 (see Figs. 2 and 4) having lugs that are pivotally connected to the fixed so called thrust bracket 22. This rock bar 30, at one end, is provided with a short arm 31 that is connected,- by a link 32, to the free end of. the vibratory lever 33, which latter is pivotedto the bearing bracket 27 and is providedwith a longitudinal slot 34. The shaft 25, at its inner end, is provided with a small crank 35 having a crank pin 36 (see Figs. 2, 3 and 1) that works in the slot 34: of the said lever 33. A small clamping roller 37 is journaled in the ears of a small slightly flexible bearing yoke 38 applied to the upwardly extended flange of the clamping bar 29, which, it will be remembered, is secured to the free ends of the carrier arm 28. The upper edge of the paper 3 may be easily slipped between the roller 37 and the clamping bar 29, and can be easily withdrawn therefrom, but the said parts 29 and 37 will frictionally hold said paper against accidental displacement while it is being carried to the proper position for deposit against the negative.

To support the loose edge of the paper 3 while it is being moved from the position shown in Fig. 4 into the position shown in Fig. 3, I have shown a light sheet metal arch plate or segment 39 which is suitably supported from the upper front portion of the frame 1.

All of the automatically actuated parts of the machine are operated from the socalled operating shaft 25, and this shaft is driven at a reduced speed indirectly and intermittently from a small electric motor, through intermediate transmission mechanism which includes the novel timing device presently to be described.

The electric motor is suitably supported on the frame 1, and its armature shaft, as shown, carries a small pulley 41. A belt 42 runs over the pulley 41 and over a larger pulley 43, loosely journaled to the frame 1 and carrying, at one side, a small driving pulley 44. A second belt 45 runs over the pulley 44 and over a relatively larger pulley 46 that is loosely journaled on the outer end of the operating shaft 25. The continuously driven pulley 46 is adapted to be coupled to the operating shaft 25 by a one-revolution clutch comprising an arm 47, a dog 48, and a driving lug 49. The arm 47 is rigidly secured to the shaft 25 between the pulley 46 and the bearing bracket 26; and the dog 48 is pivoted to the arm 47, and is engageable with the driving lug 49, which latter is carried by the pulley 46. The bearing bracket 26 is provided with an annular dog retaining surface 46 that is adapted to hold the dog 48 engaged with the driving lug 49, and the said surface 46 is provided with a lock notch 50, into which the free end of said dog 48 is normally pressed by a spring 51, best shown in Fig. 8. Pivoted to the bearing bracket 26, adjacent to the lock notch 50 is a small dog releasing lever 52, (see particularly Figs. 8 and 9). Loosely jo-urnaled on an inwardly projecting hub of the bearing bracket 26 is a sprocket wheel 53 (see particularly Fig. 11) that is provided with a stop lug 54. Loosely mounted on said shaft 25 just inward of the sprocket wheel 53 is a larger ratchet wheel 55 that is provided with a stop lug or flange 56 adapted to engage with the said lug 54 of the sprocket wheel 53. A coiled spring 57, is anchored at its inner end to the hub of the bearing bracket 26 and at its outer end is attached to the ratchet wheel 55. This spring 57 is a retracting spring which serves to throw the ratchet wheel 55. when the latter is released, backward until its flange 56 strikes the stop lug 54 of the sprocket 53. At certain times, backward movement of the ratchet wheel 55 is prevented by a springpressed retaining pawl 58 which, as shown, is loosely pivoted on a small rock shaft 59, mounted in the bearing bracket 26. This rock shaft 59 is provided at its outer end with a short arm 60 and at its inner end with a similar short arm 61. A springpressed driving dog 62 is carried by the arm 61 and operates upon the teeth of the ratchet wheel 55. The arm 60 is connected to one end of an eccentric rod 63 that is provided at its other end with an eccentric strap arranged to work upon a small eccentric 64 that is formed on the hub of the continuously driven pulley 46. Located adjacent to the ratchet wheel 55 and secured to the shaft 25 is a cam acting dog releasing wheel 65. The main peripheral portion of this releasing wheel 65 extends slightly outward of the teeth of the ratchet wheel 55, but it is provided with a short circumferentially extended depression 65 that is out below the bottoms of the teeth of said ratchet wheel and which normally stands in front of the operative ends of the dogs 58 and 62. These two dogs are wide enough to overlap both the ratchet wheel 55 and the releasing wheel 65 (see particularly Fig. 9).

A sprocket chain 66 runs over the sprocket 53 and over a similar upper sprocket 67, shown as journaled on a bolt 68 secured to one side of the frame 1. A peripherally graduated indicator wheel or disk 69 is secured to the sprocket 67, for common rotation therewith. The graduations of the indicator wheel 69 correspond in units of movement to the teeth on the ratchet wheel 55. To lock the indicator wheel 69, and hence, the sprocket 53 and its stop lug 54 in the various different adjustments, the said wheel 69 is shown as provided. with a notched flange 70 that is engaged by a spring pressed lock dog 71 pivoted to a bracket 72, secured on the frame 1, as best shown in Fig. 9.

The so-called thrust rods 23 and 24 which operate the toggles 20 and 21, respectively, are yieldingly pressed upward by springs 73 and 74, and these springs, as is evident, therefore tend to keep the said toggles buckled and the sections of the divided presser board retracted, as shown in Fig. 3. The lower end of the bifurcated head of the thrust rod 24 is formed with a horizontally extended flange 75. The head at the lower end of the thrust rod 23 is formed with a laterally projecting cam flange 76 and the latter is provided with a projecting flange 77 that underlies the flange of the thrust rod 24. Secured to the operating shaft 25 between the heads of the said thrust rods 23 and 24, is a crank head 78 provided, on one side, with a projecting cam pin 79 and, on its other side, with a similar projecting cam pin 80. The oppositely projecting cam pins 79 and 80 are located about ninety degrees apart, the former being ahead of the latter in respect to the direction of the rotation of the shaft 25.

The electric lamp 81, which, as shown, is located in the light box 2, is connected in a branch or shunt 82 of the motor circuit 82, in such manner that the motor may continuously run while the lamp 81 will be intermittently thrown into action, and when both the lamp and the motor are in action, both will be subjected to the same fluctuations in the current. The lamp shunt 82 includes a pair of normally separated con tacts 83 and 84. The cont-act 84 is shown as a spring contact which normally springs out of engagement with the contact 83, but is adapted to be forced into engagement with the said contact 83, by a small push button or prong 85. The outer end of this push button 85 is so located that it will be engaged by the upper or segmental section of the divided presser board, when the latter is forced against the print and negative.

Operation: The operation of the machine, the preferred arrangement of which has been above described in detail, is substantially as follows: The motor runs continuously and the driving pulley 46 and its eccentric 64 are continuously driven. Each rotation of the eccentric 64 causes the driving dog 62 to impart a one-tooth step movement to the ratchet Wheel 55. It will be remembered that the retracting spring 57 serves to throw the ratchet wheel 55 back to a normal or initial starting point with its flange 56 engaged with the stop lug 54 of the sprocket The said sprocket wheel 53 and its stop lug 54 are made adjustable, as already described, so as to vary this normal or initial starting position of the said ratchet wheel. When the said ratchet wheel has been given a certain or predetermined number of steps of movement, which will depend entirely upon the position in which the stop lug 54 of the sprocket 53 is set, the flange 56 of the said ratchet wheel will engage the projecting lug of the dog releasing lever 52 and will cause the latter to press the free end of the clutch dog 48 out of engagement with the notch 50 of the fixed annular retaining surface 46 and when the said dog is thus pressed, it will stand in the path of movement of, and will be engaged by the lug 49 of the continuously driven pulley 46. When the said dog 48 is engaged with the lug 49, the operating shaft 25 will be driven by the pulley 46 and will be given one complete rotation, at the termination of which, the clutch dog 48 will be again pressed into the lock notch 50 of the said flange 46*, and the rotation of the said shaft 25, is thereby positively terminated at the end of its com plete rotation. The different operations which take place when the operating shaft 25 is given the one rotation, above described, enumerated in the order in which they take place, are as follows: The paper carrier is thrown downward so as to deliver the printing paper g in proper position for printing, between the negative and the divided presser plate. About the same time, the releasing wheel 65 throws the dogs 62 and 58 out of engagement with the teeth of the ratchet wheel 55, whereupon the said ratchet wheel is returned by the spring 57 to its predetermined but variable normal, but initial position, as before stated. Immediately after the print 3 has been properly positioned in front of the negative, as above stated, the toggle 20 is drawn downward, thereby forcing the main section 15 of the pressure board or plate against the negative and thereby securing the same in proper position against the negative. Immediately following this action, the paper carrier is returned to normal position and out of the way of the upper section 16 of the presser plate, and intermediately after this takes place, the upper toggle 21 is drawn downward, and the supplemental section 16 of the presser plate is caused to press the upper portion of the print or paper 3 against the negative, and close the light circuit switch 8384. At the completion of the rotation of the operating shaft 25, the cut-a-Way portion 65 of the dog-releasing wheel 65 is brought back to its normal position shown in Fig. 8, and as soon as this takes place, the continuously vibrating driving pawl 62 again becomes operative to impart the step by step movement to the ratchet Wheel 55. The time that the divided presser plate holds the printing paper against the negative and exposed to the light from the lamps in the light box, depends upon the setting of the sprocket 53 and its stop lug 54, it being evident, that the greater the distance the said lug 54 is turned backward, the greater will be the distance that the flange 56 of the ratchet wheel 55 will be normally or initially set away from the lever 52, which, when engaged by the said flange 56, releases the dog 48, and throws the one-revolution clutch into' action. For instance, if the indicator wheel 69 be set at the 2 indication, the paper will be exposed while the pulley 46 is making two rotations, but if, for instance, the said indicator wheel 69 be set at 20 the paper will be exposed while the said pulley 46 is making twenty rotations. This mechanism, therefore, provides an extremely simple and highly efficient means for regulating the time of exposures. If the motor be constantly driven at the proper speed, the arrangement may be such that the numerical mark on the indicator wheel 69, will indicate approximately the number of seconds that the print will be exposed; but at any rate, the said numerals indicate units or proportions, or relative different times of exposure. Approximately at, but slightly before the operating shaft 25 completes its rotation, as above described, the cam stud 79, operates on the cam flange 76, and the cam stud 80 releases the cam head 76 of the thrust rod 23, and thereby positively buckles the toggles 20 and 21 and retracts both sections of the presser board. This releases the printed paper y and permits the same to drop into the receptacle 14. The separation of the printed paper from the negative is further insured by a light leaf spring or spring releasing finger 10, shown as secured to and projecting from the lower edge of the mega tive clamping head 10 (see particularly Figs. 3 and 6). When the upper section 16 of the presser board is moved to press the paper against the negative, it forces the spring finger l0 tightly against the negative, and when the presser board is retracted from the negative, the said finger serves to eflect initial separation of the paper from.

the face of the negative and to admit air so that the paper will quickly fall from the negative. I

Attention is further called to the fact that the flange 75 of the thrust rod 2:: overlaps the flange 77 of the thrust bar 23 and thereby positively causes the rod 23 to remain down when the rod 24 is held down,

and to cause the said rod 24 to move; positively upward when the said rod 23 is moved upward. v The said connections, however,

permit the rod 23 to be forced downward while the rod 24, which operates the upper section 16 on the presser board,-. -remains in its upper position. the lever 33 are arranged toimpart very rapid return movements and relatively slow paper delivering movements to the paper carrier, and the said paper carrier will remain stationary or in normal position throughout the greater portion of the opera-j tive cycle of the machineso thatample time; is afforded for properlypositioning the print-i ing paper between the clampingbar 29 and-Q The paper carrier, of course begins. its return;

roller 37 of the said paper carrier.

movement: while theprintingpaper is held against the 'negative of the presserboard, and hence, willreadily-disengage itself fromi the positioned'printing paper. The springs 73 and 74:, as already indicated, serve to,

hold the thrust rods 23'-24 in their uppermost positions with the respective toggles buckled and the correspondingsections of the presser board retracted, unless the said thrust rods are positively forced downward;

by the device described. p

The. use of the toggles for clamping the sections of the presser plate against the negative is highly important'because,- with the use thereof, a very considerablepaper clamp-- ing force is applied by theapplication of very light power to the. said toggles. In

The crank 3H6 and same fluctuations or changes in the current. With this improved arrangement, if the current increases so as to produce a more brilliant light, the motor will run correspondingly faster and correspondingly decrease the time of exposure, while, conversely, if the current decreases so as to produce a dimmer light, the motor will run correspondingly slower, thus increasing the time of exposure. This insures an absolute uniformity of prints irrespective of variations in the strength of the electric current.

l Vhat I claim is:

1. The combination with a negativeholder and a cooperating presser board, of means for intermittently moving said presser boardfcomprising a continuously movable driving element, a driven element, and a stepby-step movable connecting mechanism.

2. The combination with anegativeholder and a cooperating presser board, of means for intermittently 'moving said presser board, comprising acontinuously movable driving element, a driven element, a step-bystep ,movable connectingv mechanism, and means for varying the timed action of the said intermediate mechanism. I

, ';3. The combination with av negative holder and a cooperating presser board, of means for intermittently movingsaid presser board to and from .said negative holder,

comprisinga continuously running driving element, a driven element, a clutch'for connecting the said vdriving and driven element s, and a step-bystepmovable mechanism actuated by said driven element and operating the .said clutch to determine the time that said presser board will be held in cooperative relation with said negative holder. I p p r 4. The combination with a negativeholder and a cooperating presser board, of means for intermittently moving said presser board.

to and from said negative holder, comprising a continuously running driving element, a driven element, a clutch for connecting the said driving and driven elements, a step-bystep movable mechanism actuated by said driven element and operating the said clutch -to determinethe time that the said presser board will be held in cooperative relation to said negative holder, and means for varying the timed action of said step-by-step mechanlsm.

5. The combination with a negative holder and a cooperating presser board, of means for intermittently moving said presser board to and from said negative holder, and comprising a continuously running driving element and a driven element, of a clutch for connecting said driving and driven elements, and a clutch actuating device operative by said driving member with a timed action.

6. The combination with a negative holder and a cooperating presser board, of means for intermittently moving said presser board to and from said negative holder, comprising a continuously running driving element, a driven element, a clutch for connecting said driving and driven elements, and a clutch actuating device operative by said driving member, with a timed action, said clutch actuating device including means for varying such time of action.

7. The combination with a negative holder anda cotiperating presser board, of means for intermittently moving said presser board toward and fromsaid negative holder, comprising a continuously running driving element, a driven element, a clutch for connecting said driving and driven elements, a ratchet wheel movable in respect to said drivin v and driven elements, a cooperating driving dog actuated by said driving member, means tending 'to throw said ratchet wheel backward, anadjustable stop for limiting backward movement of said ratchet wheel, means whereby said ratchet wheel, upon reaching a predetermined advance position will operate said clutch, and a device moved by said driven member, for throwing said driving 'dog out of action and releasing said ratchet wheel.

8. The combination with a negative holder and a cotiperatin presser board, of means tor intermittenty moving said presser hoard toward and from said negative holder, comprising 'a continuously running driving element, a drivenelement,,a onerevolution clutch forconnecting said driving and dri en elements, a ratchet wheel movable in respect to said driving and driven elements, a driving dog and a retaining dog operative on said ratchet wheel, the former being actuated by the said driven member, a spring tending to throw said ratchet wheel backward, an adjustable stop for limiting the backward movement of said ratchet wheel, means whereby said ratchet wheel, upon reaching a predetermined advance position will operate said clutch, and a wheel carried by said driven member and operating to throw said driving'and retaining dogs out of action and release said ratchet wheel.

9. The combination with a negative holder and a coiiperating presser board, of means for intermittently moving said presser board to and from said negative holder and comprising a continuously running driving element and driven element, of a clutch for connecting said driving and driven elements, a clutch actuating device operative by said driving member with a timed action, a paper carrier for delivering thepaper between said negative holder and presser board, and means for intermittently moving said paper carrier.

10. The combination with a negative holder and a coiiperating presser board, of means for intermittently moving said presser board toward and from said negative holder, comprising a continuously running driving element, a driven element, a clutch for connecting said driving and driven elements, a ratchet wheel movable with respect to said driving and driven elements, a cooperating driving dog actuated by said driving member, means tending to throw said ratchet wheel backward, an adjustable stop for limiting backward movement of said ratchet wheel, means whereby said ratchet wheel, upon reaching a predetermined advance position will operate said clutch, and a device moved by said driven member, for throwing said driving dog out of action and releasing said ratchet wheel, and means for moving the said adjustable stop, comprising a sprocket and chain drive and a latch for securing the same in different adjustments. i

11. The combination with a negative holder and a cooperating presser board, of means for intermittently moving said presser board toward and from said negative holder, comprising a continuously running driving element, a driven element, a onerevolution clutch for connecting said driving and driven elements, a ratchet wheel movable in respect to said driving and driven elements, a driving dog and a retaining dog operative on said ratchet wheel, the

former being actuated by the said driving member, a spring tending to throw said ratchet wheel backward, an adjustable stop for limiting the backward movement of said ratchet wheel, means whereby said ratchet wheel, upon reaching a predetermined advance position will operate said clutch, a wheel carried by said driven member and operating to throw said driving and retaining dogs out of action and release said ratchet wheel, a sprocket wheel to which the said adjustable stop is secured, a sprocket wheel at a remote point, a latch for securing the latter sprocket in different adjustments, and a sprocket chain running over the said two sprockets.

12. In a photographic printing machine, the combination with a negative holder and an intermittently movable cooperating presser board, of 'a vibratory paper carrier for delivering the paper between said negative holder and presser board, means for intermittently moving said paper carrier and presser board, and a guide plate serving to guide the loose edge of the paper between the said negative holder and presser board, while it is being moved by the said paper carrier.

13. The combination with a negative holder, of a paper carrier movable to and from said negative holder, a presser board also movable to and from said negative holder, and actuating means for said presser board including a toggle which approaches a dead center when said presser board is moved into an operative position.

14. The combination with a negative holder, of a paper carrier movable toward and from said holder, means for operating said paper carrier, a divided presser board also movable toward and from said negative holder, toggles independently connected to the sections of the said divided presser board and arranged to approach dead centers when said sections are moved into operative positions, and timed means for operating said toggles in succession.

15. The combination with a negative holder, of a paper carrier movable toward and from said holder, means for operating said paper carrier, a divided presser board also movable toward and from said negative holder, toggles independently connected to the sections of the said divided presser board and arranged to approach dead centers when said sections are moved into operative positions, and automatic means for operating said toggles in succession, said automatic means including devices timed so that one of the said board sections would receive its operative movement while said paper carrier is in a delivering position, and the other board section will receive its operative movement while the said paper carrier is in a retracted position.

16. The combination with a negative holder, of a paper carrier movable toward and from said holder, means for operating said paper carrier, a divided presser board also movable toward and from said negative holder, toggles independently connected to the sections of the said divided presser board and arranged to approach dead centers when said sections are moved into operative positions, thrust rods connected to said toggles, and an operating shaft service to guide the ends of the said thrust rods and provided with cranks set one ahead of the other, and means operating said cranks in succession, in respect to the thrust rods.

17. In a machine of the kind described, a paper carrier comprising a vibratory arm having a clamping bar and an operating roller for engaging and yieldingly holding the paper.

18. The combination with a negative holder and a paper carrier for delivering paper thereto, of a presser board for pressing the paper against a negative held by the said holder, means for operating the negative holder and presser board, a pivoted arm to the free end of which said presser board is attached, and means independent of said arm for imparting operative movements to said presser board.

19. The combination with a negative holder, of a vibratory paper carrier, a divided presser board, pivoted arms to the free ends of which the sections of the said presser board are attached, independent toggles connected to the sections of said presser board, and means for operating said toggles in succession, substantially as described.

20. In a machine of the kind described, the combination with a pivotally mounted light box provided in one wall with a light passage and with means for holding the negative exposed in the said light passage, of a movably mounted work table operative in one position to lock the said light box with the negative holder and light passage turned upward into an inoperative position.

21. In a machine of the kind described, the combination with an approximately rectangular light box pivotally supported for movements through approximately ninety degrees, to thereby turn the same from an operative into an inoperative position and vice versa, a work table adjacent to said light box, and parallel links supporting said work table, and which work table is so arranged that it may be alined horizontally with the upper face of the said light box when the latter is turned into itsinoperative position, substantially as described.

In testimony whereof I afiix my signature in presence of two Witnesses.

GLEN M. DYE.

Witnesses HARRY D. GILGoRE, F. D. MERCHANT.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

